cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dma.c (817B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/dma-direct.h>
      3#include <linux/init.h>
      4#include <linux/swiotlb.h>
      5#include <boot_param.h>
      6
      7dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
      8{
      9	/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
     10	 * Loongson-3's 48bit address space and embed it into 40bit */
     11	long nid = (paddr >> 44) & 0x3;
     12
     13	return ((nid << 44) ^ paddr) | (nid << node_id_offset);
     14}
     15
     16phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
     17{
     18	/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
     19	 * Loongson-3's 48bit address space and embed it into 40bit */
     20	long nid = (daddr >> node_id_offset) & 0x3;
     21
     22	return ((nid << node_id_offset) ^ daddr) | (nid << 44);
     23}
     24
     25void __init plat_swiotlb_setup(void)
     26{
     27	swiotlb_init(true, SWIOTLB_VERBOSE);
     28}